Washington (CNN) - Assistant Secretary of Diplomatic Security Eric Boswell and two other officials resigned in the wake of a review of security failures in Benghazi, Libya, two senior State Department officials told CNN Wednesday.

The independent review of the September 11 attacks on the U.S. Consulate in Benghazi released Tuesday cites "systemic failures and leadership and management deficiencies" at the State Department.

(CNN) - President Barack Obama said Wednesday that Vice President Joe Biden will lead an administration effort to develop recommendations no later than January for preventing another tragedy like last week's school shooting in Connecticut that left 20 young children and six adults dead.

The vast majority of gun owners in America are responsible, but the more than 10,000 Americans killed every year by guns was "violence we cannot accept as routine."

"We won't prevent them all, but that can't be an excuse" not to try, the president added.

As for the National Rifle Association, Obama said the pro-gun lobby in the United States, "has members who are mothers and fathers" likely impacted by the shooting.

(CNN) - President Barack Obama offered the condolences of a nation to the people of Newtown, Connecticut, during a memorial service Sunday night, saying, "All across this land of ours, we have wept with you. ... Newtown, you are not alone."

Saying "we can't accept events like this as routine," Obama said he'll use "whatever power" he has to prevent "more tragedies like" what happened Friday in Newtown, Connecticut, where 26 were killed in a mass school shooting before the gunman killed himself.

(CNN) - Doctors said Wednesday the prognosis is excellent for California Gov. Jerry Brown, who is undergoing treatment for localized prostate cancer.

"Fortunately, this is early-stage localized prostate cancer, which is being treated with a short course of conventional radiotherapy," said oncologist Dr. Eric Small of the University of California, San Francisco, according to a statement from Brown's office.

Phnom Penh, Cambodia (CNN) - Barack Obama became the first sitting U.S. president to visit Myanmar on Monday, praising the courage of fellow Nobel Peace Prize winner Aung San Suu Kyi while also providing a symbolic nod to initial reforms in a nation once notorious for political repression.

Later, Obama traveled to Cambodia for a summit of regional leaders and held what an aide called a "tense"meeting with the host country's prime minister that emphasized the need for improving human rights there.

Washington (CNN) - Former CIA Director David Petraeus is expected to testify Friday before congressional lawmakers that he knew "almost immediately" the attack on the U.S. Consulate in Benghazi, Libya, was the work of a loosely-formed militia with members sympathetic to al Qaeda.

Petraeus' testimony will be behind closed doors before Republican and Democratic members of the House and Senate intelligence committees looking into the September 11 attack that left four American dead, including U.S. Ambassador Chris Stevens.